Push rod for internal combustion engine



.March 8, 1960 g.. H.. MQYE @uga 1w@ m www@ @@Mugfrm mm@ wilg@ my @enlas? IN1/mm2.. amm H, Moy@ FIG@ United States Patent' PUSH ROD FORINTERNAL COMBUSTION ENGINE Benjamin H. Moye, Warren, RJ.

Application May 29, 1957, Serial No. 662,410

1 Claim. (Cl. 12S-90) My present invention relates to an internalcombustion engine and more particularly to a novel push rod foractuating the valves.

The principal object of the present invention is to prt vide a push rodconstruction which will virtually eliminate the tappet noises from aninternal combustion engine.

Another object of the present invention is to provide a push rodconstruction which will increase the eflciency f the engine.

A further object of the present invention is to provide an improved pushrod which can readily be applied to existing constructions.

Another object of the present invention is to provide a novel push rodconstruction which s easy and economical to assemble and install.

With the above and other objects and advantageous features in view, myinvention consists of a novel arrangement of parts more fully disclosedin the detailed description following, in conjunction with theaccompanying drawing and more fully defined in the appended claims.

In the drawings:

Fig. l is a Vertical section of a valve and push rod assembly embodyingmy invention.

Fig. 2 is a similar view with the valve in open position.

Fig. 3 is a perspective view of the converting sleeve,

Fig. 4 is a fragmentary sectional view of another application of myinvention.

Certain makes of automobile engines, equipped with overhead valves, areinclined to be noisy. This tappet noise develops between the push rods,the rocker arm and the valve. As the parts wear, the noise increases.Furthermore, the vibration of the engine causes a similar vibration ofthe valves and a slight leakage of air passes the valve stem and seat.This reduces the vacuum pressure through the carburator and reduces theefliciency of the engine.

The present invention is designed to improve engine performance andvirtually eliminate tappet noises. This is accomplished by providing aconstant yielding contact between all the parts from the tappet and pushrod to the valve.

Referring more in detail to the drawing illustrating my invention, theengine block is provided in the conventional manner with a valve 11having a vertical valve stern 12 and the spring arrangement 13 fornormally retaining the valve in closed position shown in Fig. 1. Thevalve actuating mechanism comprises the cam 14 on which the verticallyextending tappet 15 rides. Extending upwardly from the tappet 15 is apush rod 16. The top of the valve block lil has a shaft 17 which issupported by studs 18 and a rocker arm 19 is mounted on the shaft sothat one end 29 bears on the upper end of the valve stem 12. The otherend of the rocker arm 19 is provided with an adjustable screw 21 andhaving a spherical end 22, which rides in a socket 23 in the upper endof the push rod 16. Normally, with the above construction the necessaryclearance is provided between the end ofthe arm 19 and the top of thevalve stem 12. However, as the parts wear the rocker arm becomes looseon its bearings and no amount of adjustment on the screw 21 willcompensate for the looseness of the parts. The engine is then noisy andthe valve vibrates.

The present invention provides a construction which is readily adaptableto the existing push rods and which interposes a yielding connectionwhich keeps the various parts in continued contact. Referring again toFig. 1, the push rod 16 is severed at a point above the engine block 10so that the upper portion thereof 24 becomes a short length carrying theflared socket 23. A sleeve 25 is provided with a central opening 26extending into the sleeve from both ends but leaving a solid wallportion 27 intermediate the ends of the opening 26.- The sleeve 25 ispositioned over the lower portion of the push rod 16 until the wallportion 27 rests on the top end of the push rod. A coil spring 28 isthen slipped over the upper portion 24 of the push rod and the upperportion is now pushed into the upper end of the opening 26 as shown inFig. l.

The coil spring 28 is preferably provided with a finished lower end sothat it will rest llatly against the top of the sleeve 25. The upper endof the coil spring 28 is left free so that it will ride around theflared socket portion 23 which acts as an upper stop for the spring. Itis essential that the spring 28 have less tension than the valve spring13. For example, the valve spring may have a tension of approximately 52or 53 pounds. in such cases the spring 2S is provided with a tension ofapproximately 30 pounds. Also the spring 28 is of such length that itwill keep the upper portion 24 of the push rod from completely enteringthe opening 26 leaving a space 29 below the end of the portion 24 andthe wall portion 27.

With the construction illustrated in Fig. 1 the spring 23 will retainall the parts in yielding contact with each other. As the cam 14 rotatesinto valve opening position, as shown in Fig. 2, the tappet 15 and pushrod 16 are pushed upwardly and the spring 28 is compressed until thelower end of the rod 24 hits the wall portion 27. From that point on theentire assembly moves upwardly as a solid rod and the rocker arm 19functions in the normal manner to open the valve 11. Continued movementof the cam will return the parts into the position shown in Fig. 1, andany slack caused by wear of the parts is taken up by the spring 28 sothat the parts remain in contact with each other.

I have found that the above construction and operation not onlyeliminates tappet noises but the contact of the end 20 of the rocker armon top of the valve stern 12 prevents the vibration of the valve andreduces any leakage through the valve. Tests have shown that the vacuumpressure of the engine is increased thus reducing gasoline consumption,

The above construction illustrates the device applied to a solid pushrod. In some engines the push rod 16 comprises a hollow tube. Referringto Fig. 4 the tube push rod 30 is severed adjacent the upper end. A plug31 is then pushed in the remaining end of the rod. I now provide anauxiliary upper hollow portion 32 carrying the socket 33. The portion 32is of slightly larger diameter than the push rod 3l). The lower internalend of the portion 32 is provided with shoulders 34 to limit thevertical sliding movement of the member 32 over the push rod 30. Aspring 35, similar to the spring 28 in Fig. 1 is positioned inside ofthe member 32 with the lower end resting on the plug 31 and in relaxedposition retaining the shoulders 34 a slight distance above the plug 31.The operation of the device is identical with that of the form shown inFigs. 1 and 2.

In setting the valves, the adjustable screw 21 is pushed downwardlycompressing the spring 28 into the position 3 shown in Fig. v2. Thescrew 21 is then adjusted to provide the necessary valve clearance inthe end of the rocker arm 20. The pressure is then released and theparts will assume the position shown in Fig. 1. The assembly of 'thepresent invention is simple in construction and easy to install. Otheradvantages of the invention will be readily apparent to a person skilledin the art.

i claim:

A push rod for an internal combustion engine positioned between a earnand the valve operating rocker arm, comprising a lower rod portionresting on said cam, an upper rod portion bearing against said rockerarm, and means for retaining said rod portions in alignment and inyielding contact with said cam and rocker arm, said means including asleeve having opposed openings, one 15 2,677,358

4 opening receiving said lower rod portion and the other openingreceiving said upper rod portion, and an integral wall between saidopenings, `and a coil spring surrounding said upper rod portion andhearing against said sleeve.

References Cited in the file of this patent UNITED STATES PATENTS1,443,940 Anderson Feb. 6, 1923 1,607,128 Johansen Nov. 16, 19261,613,815 Anderson Jan. 11, 1927 1,905,888 Berry Apr. 25, 1933 2,525,791Good Oct. 17, 1950 2,564,902 Heuser etal. Aug. 21, 1951 Wright May 4,1954

